Crushing-rolls.



W. N. TANNER.

cRusHlNs ROLLS.

APPLICATION FILED NOV. 29. 1915.

1 1 98,603. Patented Sept. 19, 1916.

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WALLACE N. TANNER, 0F ANACONDA, MONTANA.

@RUSHING-ROLLS.

Specicatcn of Letters Eatent.

Patented Sept. 19, 1916.

Application filed November 29, 1915. Serial No. 64,014.

To all whom t may concern Be it known that I, WALLAon N. TANNER, a citizen of the United States, residing at Anaconda, in the county of Deerlodge and State of Montana, have invented certain new and useful Improvements in Crushing-Rolls, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention has relation to improves ments in crushing rolls; and it consists in the novel features of construction more fully set forth in the speciiication and pointed out in the claims.

The present improvement is specifically directed to the outer shell of a crushing roll, that is to say, to the outer annular steel member surrounding the core of the roll, the object of the invention being to obtain a shell of maximum width from material which will crush a maximum quantity of rock to the pound of steel used up. Under present conditions it appears to be impossible for any mill to roll a steel shell of twenty-four (2d) inch face thereby making it necessary, where capacity is the object sought, to employ cast steel shells which are inferior in crushing life to the preferred roll steel shell. ln order therefore that roll steel may be availed of, a splittingof the shell is necessary so that we have a shell composed of two sections separating along a plane disposed parallel to the plane of rotation of the roll. In the present embodiment of my invention the separating plane or oint between the shell sections is located to one side of the center line of the roll, the object of this arrangement being to reduce the wear at the joint by enabling a pair of rolls to be assembled without having their joint planes coincident.

A further object of my invention is to provide suitable and simple means of securing or wedging the shell sections to the core, all as will be fully apparent from the following detailed description of the invention in connection with the accompanying drawings, in which- Fignre l represents a pair of assembled rolls, one being in middle transverse section and the other in elevation (partly broken away), the shafts being shown in elevation; Fig. 2 is an end view of the roll, the shaft being in cross-section; Fig. 3 is an enlarged transverse radial sectional detail showing the manner of securing the shell to the core; Fig. e is an end view of the shell, the core being removed; Fig. 5 is a middle transverse section through the shell; Fig. 6 is an end view of the wedge ring interposed between the core and shell; Fig. 7 is a middle transverse section through the wedge ring, the plane of section passing through the openings receiving the tightening bolts; and Fig. S is an enlarged radial cross-sectional detail through the wedge-ring on the line 8 8 of Fig. 6.

Referring to the drawings, S represents the shaft of the roll, the same having keyed or otherwise secured thereto the core 1, rotation being imparted to the shaft (and roll) from any suitable source of power (not shown). rlhe peripheral surface of the core 1 is that of two truncated cones set base to base, and meeting along the central peripheral ridge a as shown. When two rolls are assembled as shown in Fig. 1 the ridges a of the respective rolls lie in a central planel indicated by the broken line ai in said figure. rllhe shell comprises the sections 2 and 3, the section 2 being the narrower, thereby bringing the joint 71., or plane of separation between thc sections to one side of the center line @c of the roll. This arrangement pernits the assembling of a pair of rolls in such manner as to bringthe oint or seam 7L of one roll out of coincidence or alincment with the joint or seam of the coacting roll (Fig. 1), thereby reducing the wear at the joints in the normal operations of the rolls.

It will be seen that the inside surfaces of the shell sections are conical with the apex of the cone toward the center; and inasmuch as the plane of division or separation between the sections is to one side of the center, and being that the inclinations of the conical surfaces of the sections are the same, it follows that the inner terminal of the conical surface of the wider section 3 would form an offset or shoulder with the adjacent terminal of the conical surface of the narrower section, were the conical surface of the wider section continued the full width of the section. To prevent this oifset is the purpose of the annular counterbore b at the inner end of the conical surface of the wider shell section, said counterbore forming an annular space or enlargement adjacent the joint 7 1, for the'full and necessary play of the wedge rings interposed between the opposed conical surfaces of the core and shellsections respectively.

The wedge-ring 4 is a. preferably steel ring split at the point m (Fig. 6) so as to allow it to spring tightly against the inner surface of the shell section, said ring being conical or wedge shaped in cross-section (Fig. 8), the inner and outer conical surfaces thereof conforming respectively to the inclinations of the outer and inner conical surfaces of thc core and shell section between which the ring is interposed. Disposed at intervals along the ring are transverse slots or grooves or equivalent passage-ways cl opening inwardly, the bases of the slots being rounded for the reception of the bolts 5, the terminals of the slots being formed into enlargements c for the reception and housing of the heads t and nuts n. of the bolts, the bases of the enlargements c forming shoulders or seats s for the nuts and heads and the washers w as shown to best advantage in Fig. 3. By inserting the wedge rings et between the core l and the respective shell sections, then inserting the bolts 5 through the alining openings CZ of the respective wedge rings, and applying the nuts n, it is apparent that with the tightening of the nuts, the wedges 4 will be drawn into firm engagement with the members l and 2, 3, thereby locking the shell to the core, the spring of the metal of the ring insuring contact thereof with every portion of the inner surface of the shell section engaged thereby. The nuts likewise tend to draw the shell sections together.

Obviously, the details shown may be departed from without in any wise affecting the nature or spirit of the invention. It is apparent too that the shell is not to be restricted in use to crushing rolls, but may be applied to any rotating members designed to be equipped with outer shells. The outer or peripheral surfaces of the shells need not be cylindrical, but may be of any convenient contour.

Having described my invention what I claim is:

l. In a pair of assembled rolls engaging one another along their peripheries, shells for the rolls each composed of sections of unequal width, a section of one shell being of the same width as the corresponding section of the opposite shell, the smaller sections of the shells of the respective rolls being disposed contiguous to, but on opposite sides of, a central plane through the assembled rolls, said plane intersecting the larger sections of the respective shells.

2. In a pair of assembled rolls coperating with5 one another along their peripheries, shells for the rolls each composed of two sections of unequal width, a section of one shell being of the same width as the corresponding section of the opposite shell, the smaller sections of the shells of the respective rolls being disposed contiguous to, but on opposite sides of, a central plane through the assembled rolls, the larger shell sections be ing cut by said plane.

3. In combination with a core having a double truncated conical peripheral surface with the bases of the cones meeting along a central ridge, shell sections of unequal widths surrounding the core and meeting along a seam or joint disposed to one side of the ridge aforesaid, the inner surfaces of the shell sections being conical with the apex of the cone toward the center, the wider section being provided with a counterbore opposite the ridge aforesaid, and means interposed between the counterbore and ridge for locking the shell sections to the core.

In testimony whereof I my signature, in presence of two witnesses.

WALLACE N. TANNER. l/Vitnesses:

ARGHIE N. JILLE, W. C. Carnon.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

